LND150 as audio switch?

[d95err]

Would it be possible to use an LND150 MOSFET as a high voltage audio switch, similar to how JFETs are used in low voltage designs?

My primary goal would be to use it for a simple noise gate in an amp where signal voltages would be too high for JFETs.

I can see from the datasheet that the on resistance is relatively high (850 ohms), but that would probably be OK for my purposes.

Or are there other types of devices more suitable? I'm guessing that Vactrols would be too slow for a noise gate.

[R.G.]

Yes, but...
It's still a MOSFET with a substrate body diode, so you have to use two of them source-to-source, and turn them both on and off. This would be possible with one of the LED to photo-voltaic isolators that exist.

[exclamationmark]

You can try using solid state relays (like the PS7141e or some panasonic ones). They have a shunt capacitance of something like 35pF, but that's still a lot better than a lot of HV fets. The response times are a little slow at 1ms. I'm assuming by noise gate you mean some sort of dynamic muting circuit, which it'll probably be fine for.

[Gregg]

If you have an effects loop you can use regular JFETs without any problem. For example make a voltage divider after the FX loop CF something like 22k/1k and put a J174/5 in parallel with 1k. Works very well.